BBC Four Wednesday

Will Millard explores some of Wales's forgotten historic buildings, meeting the individuals trying to save these vulnerable structures before it is too late

Telling the story of the rare discovery of evidence of Roman crucifixion, unearthed in a routine archaeological dig in the Cambridgeshire Fens

Neil Robertson v Chris Wakelin. Further coverage of the eighth and final first-round match at Alexandra Palace in London, played over the best of 11 frames

Smiley gains all the information he needs and narrows down his search for the mole. Classic espionage drama, starring Alec Guinness

Smiley devises a plan he hopes will flush out the mole, who will be used as a trade against several English spies captured by the KGB

Documentary following life in a greater horseshoe bat roost for four months, with night-vision cameras and ultrasonic detectors capturing the hidden world of the colony

Chris Beardshaw investigates where soil comes from and what it is made of by using specialist microphotography, showing the substance as it has never been seen before

Will Millard explores some of Wales's forgotten historic buildings, meeting the individuals trying to save these vulnerable structures before it is too late

Documentary following life in a greater horseshoe bat roost for four months, with night-vision cameras and ultrasonic detectors capturing the hidden world of the colony